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700 ultramag to STW??

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Old 02-01-2008, 10:09 AM
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Posts: 163
700 ultramag to STW??

Trying to help a friend.....he wants a stainless left hand 700 in 7 STW (has tons of brass, dies etc)......we can get a stainless left hand 338 ultramag donor rifle cheap, but I'm wondering if the feed rails will work for the stw case or would they be too wide???

Anyone rebarreled a 700 ultramag action to a standard belted mag cartridge??
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Old 02-01-2008, 11:01 AM
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Join Date: Jul 2004
Location: Texas
Posts: 5,446

It should work fine but if it doesent then you can go to a
Watts box Center feed that is easy to install.

But try the action with no modifications first.

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Old 02-01-2008, 11:35 AM
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Thanks, but we don't have the action and need to know before we order the donor rifle. If it won't work with the feed rails as is, we will probably try to find a donor in 300 win or 7 mag......
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Old 02-01-2008, 03:12 PM
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Join Date: Feb 2005
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Back in the late 90's we built lots of them for customers.
It will work without any changes to the rails or the follower. remember that the barrel needs to be at least 26 inches to get the true benefit of the caliber. All mine have muzzle breaks so they are just under 30 inches.
The 7STW has been one of my favorites for most of 10 years even back when it was a wildcat. I used it in Alaska on browns and on caribou, in Idaho and New Mexico for Elk.
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Old 02-01-2008, 04:47 PM
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You built them on ULTRAMAG actions in the late 90's???
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Old 02-01-2008, 07:12 PM
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Location: Texas
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I think worst case you just get the Std Mag magazine box and follower from Remington and switch them out. The RUM case is larger in diameter and the STW might pop up too quick out of a RUM box. I would try it first, tho.

Good luck with the project, Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member

A big fast bullet will beat a little fast bullet every time
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Old 02-02-2008, 04:59 PM
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Join Date: Nov 2006
Posts: 29
I beleive the difference between a standard belted case's belt and an RUM, WSM case wall at the head etc. is around .017". With an Ultra Mag Receiver's feed rails being at least .0085" per side larger, a standard belted case may not be held in the mag box as good?? I'd research it closley before I ordered the receiver. Thats just my .02 worth.
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